Gerard spoke about having to beef up by undertaking a gruelling workout regime last year.

Rugged: Gerard has been sporting an unkempt beard as he takes on the role of a Scottish lighthouse keeper James Ducat in the movie

Real events: Keepers is based on a true story that took place in the 1900s, which was dubbed the Flannan Isles mystery

Plot: Following their strange disappearance, the bodies of the men were never found and conspiracy theories remain about who or what could have taken them from their post

He told GQ magazine: 'Right now I’m training five times a week.'

Gerard added: 'It’s always a little harder when you’re on the road, unless you’re there for a while.

'I do a lot of cardio but I’m starting to lift heavy because in my next movie I’m supposed to be beefy, a big undercover cop in LA covered in tattoos – so it’s not big and cut, it’s just big! That’s a pain, it hurts.'

Tough! Gerard spoke about having to beef up by undertaking a gruelling workout regime last year